US6971310B1 - Method of operation of a printing unit and printing unit for offset machine - Google Patents

Method of operation of a printing unit and printing unit for offset machine Download PDF

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Publication number
US6971310B1
US6971310B1 US10/089,456 US8945602A US6971310B1 US 6971310 B1 US6971310 B1 US 6971310B1 US 8945602 A US8945602 A US 8945602A US 6971310 B1 US6971310 B1 US 6971310B1
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US
United States
Prior art keywords
coating
unit
roller
printing unit
water
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Expired - Fee Related
Application number
US10/089,456
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English (en)
Inventor
Henrik Christiansen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tresu Production AS
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Tresu Production AS
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Filing date
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Application filed by Tresu Production AS filed Critical Tresu Production AS
Assigned to TRESU PRODUCTION A/S reassignment TRESU PRODUCTION A/S ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHRISTIANSEN, HENRIK
Application granted granted Critical
Publication of US6971310B1 publication Critical patent/US6971310B1/en
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/08—Print finishing devices, e.g. for glossing prints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices

Definitions

  • the present invention concerns a method for operating a printing unit in which the printing unit comprises a doctor blade used for coating and as moistening unit for applying water, and where the coating means and the water application means are constituted by a unit comprising a doctor blade and at least one roller for transferring coating or water from the doctor blade.
  • Offset machines are well-known within the art and are therefore only described briefly.
  • a web or a sheet on which printing is to be performed is led around back-pressure rollers or transfer rollers.
  • the web or the sheets are brought into contact with a blanket cylinder for being applied the print to the applied in each single printing unit in the offset machine.
  • the blanket cylinder is in contact with a plate cylinder transferring the colour print to be placed on the web.
  • the plate cylinder is in contact with a moistening unit and a inking unit applying water and ink, respectively.
  • an offset plate on the plate cylinder is rotated whereby water susceptible parts are moistened by the rollers of the moistening unit.
  • the ink susceptible parts of the offset plate are supplied with ink from the ink rollers in the inking unit.
  • the print image formed is then deposited on the blanket cylinder which further prints the ink on the web or the sheet.
  • it will be a paper web but other materials may also be printed.
  • a printing unit according to the present invention may be used in a traditional offset machine, for example of the kind described in European patent application no 767,058.
  • the content of this patent application is hereby incorporated by reference as the printing unit may be a part of an offset machine which is built up according to the same principle and with the same paper delivering and paper receiving means at the beginning and the finish of the printing unit as well as corresponding means for transferring paper web or single sheets between different printing units disposed in succession can be used for imparting the web the finished print.
  • the same kinds of printing ink may be used.
  • Offset machines may be equipped with a coating unit.
  • the coating unit will typically be constructed with a cylinder on which the coating is applied from a roller arrangement which is supplied from a vessel with clear coating.
  • GB-A-2,119,711 discloses a stationary fountain comprising a doctor blade co-operating with a ductor.
  • a lacquer roller is displaceable between a first position for transferring water via a plate cylinder and a second position for transferring coating directly to the blanket cylinder.
  • the doctor blade could be displaced together with the interactive roller as a unit.
  • this is achieved by a method which is peculiar in that the doctor blade and an interacting roller are displaced between a first position for transferring water via a plate cylinder to a blanket cylinder and a second position for transferring coating directly to the blanket cylinder.
  • the printing unit for use by the method is peculiar in that the coating and water application unit is arranged slidable between a first position for bringing said at least one roller in contact with a roller engaging the plate cylinder, and a second position for bringing said at least one roller in direct contact with the blanket cylinder of the printing unit.
  • the method and the apparatus make it possible that the doctor blade together with the roller form a unit which is slidable between the two positions.
  • the slidable unit may be designed so that it may be retrofitted on existing offset machines.
  • Coating or water from the chamber is transferred to the blanket cylinder or the plate cylinder via a roller which preferably is a screen roller in the form of an Anilox roller, and the liquid lying in the cups of the screen roller is transferred to the blanket or plate cylinder.
  • a roller which preferably is a screen roller in the form of an Anilox roller
  • Transfer of water to the plate cylinder occurs as a rubber roller is inserted between the screen roller and the printing plate of the plate cylinder.
  • Transfer of coating occurs directly to the blanket cylinder from the screen roller.
  • the transfer unit When the transfer unit is displaced to its second position for contact with the blanket roller, it is also possible to run flexographic printing.
  • the blanket cylinder is provided with a printing plate, and the plate cylinder is displaced out of contact with the blanket cylinder. Then flexo inks may be transferred from the chamber and the transfer roller in the shape of an Anilox roller to the printing plate.
  • a blanket may be used on the blanket cylinder as in the case of coating.
  • doctor blades for inking/coating and water application.
  • the coating means only comprise one screen roller in the form of an Anilox roller for transferring the coating which is applied directly form the doctor blade to the blanket cylinder.
  • the motor used for driving the screen roller is independent in order to adjust the rotational speed to different offset machines.
  • the unit does not need a special adaptation of the drive of the screen roller for different offset machines.
  • there will only be need for a suspension which in its most simple form consists of four pegs or screws on a rack.
  • the unit according to the invention may also be use as a moistening unit.
  • a moistening unit In the known moistening units, an environmental problem arises. In order to transfer the moistening water with the present roller arrangement, it is necessary to add solvents. At the moment, this has been prohibited at several places.
  • a system which comprises a doctor blade and a screen roller and a rubber roller between the doctor blade and the plate cylinder as described in the above International patent application.
  • the amount of water or water sausage formed in a wedge-shaped interspace between the rubber roller and the plate cylinder may be varied by running with varied speed between the rubber roller and the plate cylinder. By running the rubber roller with greater speed it is thus possible to provide a greater amount of water in the wedge.
  • the amount of water may also be adjusted by varying the slot width occurring between the rubber roller and the plate cylinder.
  • the printing unit according to the invention is thus advantageous in that the amount of water situated in the slot may be varied according to need.
  • printing unit may be intended for coating and as moistening unit, it will be possible to use the same unit consisting of a doctor blade and transfer roller for both water and coating.
  • FIG. 1 shows a side view of a typical offset machine comprising four printing units
  • FIG. 2 shows a partial view for illustrating a known printing unit comprising a moistening unit and an inking unit
  • FIG. 3 shows a view corresponding to FIG. 2 for illustrating an embodiment of a printing unit according to the above International patent application
  • FIG. 4 shows a view corresponding to FIG. 3 for illustrating a first embodiment of a printing unit according to the invention
  • FIG. 5 shows a view for illustrating a further embodiment of a printing unit according to the invention.
  • FIG. 1 shows a traditional offset printing machine 1 comprising four printing units 2 .
  • the machine has a transport direction 3 for sheets that are printed.
  • the sheets comes from a delivery station 4 and are conveyed to a receiving station 5 by means of a delivery arrangement 6 comprising a conveyor belt 7 .
  • the conveyor belt 7 runs about two chain wheels 8 , 9 .
  • the single sheets are conveyed from the unit 4 via a path 10 around an impression cylinder or back-pressure cylinder 12 .
  • the single sheets are placed at a position indicated by 13 .
  • the sheets are thus placed in an area between a blanket cylinder 14 and the impression cylinder 12 .
  • the blanket cylinder 14 is in contact with a plate cylinder 15 .
  • the offset machine also comprises transfer cylinders 16 for the sheets.
  • the offset machine furthermore comprises gripping means for holding sheets and a long row of rollers for moistening units and inking units which are in connection with the plate cylinder. Since these are well-known, they are not shown in FIG. 1 which serves as illustration of the structure of the offset unit. These rollers, however, appear in FIG. 2 .
  • FIG. 2 shows a printing unit 1 comprising an impression cylinder 12 , a blanket cylinder 14 and a plate cylinder 15 . These cylinders are rotating according to the arrows 17 , 18 , 19 .
  • a moistening unit comprises a container 21 for water. From the water container 21 the water is led via a system of rollers 22 to the last contact roller 23 which is in contact with the plate cylinder 15 .
  • the printing unit 1 furthermore comprises an inking unit 24 comprising a number of rollers 25 transferring ink from an ink container 26 to contact rollers 27 which apply the ink on a soft printing plate (not shown) situated on the plate cylinder 15 .
  • the printing plate located on the plate cylinder will thus be imparted ink in the areas where water has not been applied from the moistening unit 20 .
  • the printing plate is usually an etched metal plate.
  • FIG. 2 may also be said to illustrate a coating unit.
  • the coating will thus be conveyed up from the container 21 containing coating and transferred via rollers 22 to the last contact roller 23 which is also called the forming roller.
  • a coating unit will preferably be mounted on the blanket cylinder 14 for avoiding undesired dirtying.
  • the printing unit in FIG. 2 may be modified as illustrated in FIG. 3 .
  • the contact roller 23 is substituted by a unit 28 comprising a doctor blade system 30 and a screen roller 29 , preferably an Anilox roller of the kind also used for flexographic printing.
  • the screen roller 29 may be mounted directly in the existing suspension.
  • a soft roller 32 preferably a rubber roller.
  • the unit 28 may, even by great peripheral speeds, ensure a constant and uniform amount of water and/or coating transferred to the plate cylinder 15 . If the unit 28 is desired to be used for coating, the rollers 27 of the inking unit are brought out of contact with the plate cylinder 15 . If the unit 28 is used for water application, the inking unit 24 is kept in engagement with the plate cylinder 15 .
  • the embodiment shown in FIG. 3 may be changed when it is only used for coating.
  • the hard screen roller 29 may be used directly without a soft roller for coating. This will, however, necessitate the use of a rubber blanket on the plate cylinder 15 .
  • the printing unit shown will be very simple and easy to maintain. At the same time, the system is easy to replace depending on whether the printing unit is desired to be used for one or the other purpose. Thus it will be possible, according to wish, to use the existing moistening unit concurrently with the unit 28 according to the invention.
  • the rubber roller 32 may be provided with its own motor which is driven independently of the plate cylinder. This creates possibility of a differentiated periphery speed and thereby possibility of stemming up of greater or lesser amount of water in the wedge-shaped interspace 31 formed between the rubber roller 32 and the plate cylinder 15 .
  • FIG. 4 is shown a first embodiment of a printing unit 1 according to the invention.
  • FIG. 4 differs from the printing unit shown in FIG. 3 by the unit 28 being suspended pivotably about an axis 33 of pivot running in parallel with axes of rotation 34 and 35 for the blanket cylinder 14 and the plate cylinder 15 .
  • the unit 28 is shown in a first position 36 , where the screen roller 29 is in contact with a soft roller 32 engaging the plate cylinder 15 , and a second position 37 where the screen roller 29 is directly engaging the blanket cylinder 14 .
  • These two positions are used for water application (position 36 ) and coating (position 37 ), respectively.
  • FIG. 5 shows a further embodiment of a printing unit according to the invention.
  • This printing unit there is simultaneous use of two units 28 .
  • the unit 28 illustrated to the right in the Figure is used for applying moistening water.
  • the unit 28 shown to the left is used for applying coating. Since it is possible to divide up the doctor blade over its length, it will be possible to apply coating in stripes where the moistening unit does not apply any moisture. Such an effect will not be possible in traditional printing units.
  • the coating unit and the moistening unit as illustrated in FIG. 5 will function according to the same principle as explained above with reference to the preceding Figures.
  • the unit 28 in the left side may be used for transferring coating and flexographic ink. If there is a blanket on the blanket cylinder 14 , a completely covering ink will be printed, and if a printing plate is placed on the blanket cylinder 14 , a desired flexographically printed image may be established.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Methods (AREA)
  • Rotary Presses (AREA)
  • Treating Waste Gases (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Dot-Matrix Printers And Others (AREA)
US10/089,456 1999-10-01 2000-09-29 Method of operation of a printing unit and printing unit for offset machine Expired - Fee Related US6971310B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK199901408A DK199901408A (da) 1999-10-01 1999-10-01 Fremgangsmåde til drift af et trykværk samt trykværk til offsetmaskine
PCT/DK2000/000542 WO2001025010A1 (en) 1999-10-01 2000-09-29 Method of operation of a printing unit and printing unit for offset machine

Publications (1)

Publication Number Publication Date
US6971310B1 true US6971310B1 (en) 2005-12-06

Family

ID=8104514

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/089,456 Expired - Fee Related US6971310B1 (en) 1999-10-01 2000-09-29 Method of operation of a printing unit and printing unit for offset machine

Country Status (9)

Country Link
US (1) US6971310B1 (de)
EP (1) EP1218185B1 (de)
JP (1) JP2003511262A (de)
AT (1) ATE295779T1 (de)
AU (1) AU7405900A (de)
DE (1) DE60020252T2 (de)
DK (1) DK199901408A (de)
ES (1) ES2241655T3 (de)
WO (1) WO2001025010A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050247228A1 (en) * 2004-05-04 2005-11-10 Muller Martini Holding Ag Apparatus with slide-in unit and coating device attached thereto
US20060191429A1 (en) * 2003-04-01 2006-08-31 Jensen Jesper R Printing with flexographic inks and lacquer
US20080092758A1 (en) * 2006-10-20 2008-04-24 Hiromitsu Numauchi Stop position control method and apparatus of rotary stencil printing press
US20080173194A1 (en) * 2007-01-19 2008-07-24 Julius Domotor Lithographic offset press and method of applying a thin layer of moisture directly to a blanket cylinder
US20080229954A1 (en) * 2007-03-20 2008-09-25 Komori Corporation Cleaning apparatus
US20080229953A1 (en) * 2007-03-20 2008-09-25 Komori Corporation Cleaning apparatus

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070272104A1 (en) * 2006-05-05 2007-11-29 Aradiant Coating device
JP4246256B2 (ja) * 2007-02-05 2009-04-02 日本平版機材株式会社 オフセット印刷いわゆる平版印刷方式用使用水の表面張力を低減し、湿し水とする装置
JP6677544B2 (ja) * 2016-03-22 2020-04-08 株式会社小森コーポレーション 両面バーニッシング機

Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1138055A (en) 1966-09-03 1968-12-27 Baker Perkins Ltd Improvements in rotary offset printing units
GB2119711A (en) 1982-05-05 1983-11-23 Polygraph Leipzig Combined moistening and lacquering means in a printing machine
US4421027A (en) * 1981-04-25 1983-12-20 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Multiple printing mode printing machine system
JPS59209875A (ja) 1983-05-16 1984-11-28 Komori Printing Mach Co Ltd 印刷機用給水・ニス塗り兼用装置
DE3500437A1 (de) 1984-04-04 1985-10-17 VEB Kombinat Polygraph "Werner Lamberz" Leipzig, DDR 7050 Leipzig Schalteinrichtung fuer ein kombiniertes feucht- und lackierwerk
US4567823A (en) 1982-06-07 1986-02-04 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Arrangement on multi-color rotary presses for application of liquids to a printing unit cylinder
GB2184982A (en) 1985-12-04 1987-07-08 Luigi Ghisalberti Printing machines with multiple liquid supplying trains
US4722273A (en) 1985-03-01 1988-02-02 Heidelberger Druckmaschinen Ag Washing device for washing a rubber blanket in a rotary offset printing press
US4741269A (en) * 1986-08-01 1988-05-03 Graphic Specialties, Inc. Dampening apparatus for printing press
US4796556A (en) 1987-06-24 1989-01-10 Birow, Inc. Adjustable coating and printing apparatus
DE3941571A1 (de) 1988-12-27 1990-06-28 Polygraph Leipzig Verfahren und einrichtung zum verarbeiten von spezialfarben in bogenoffsetdruckmaschinen
EP0574124A1 (de) 1992-05-06 1993-12-15 DeMoore, Howard W. Beschichtungsvorrichtung für eine Offset Bogenrotationsdruckmaschine
US5503674A (en) 1993-04-20 1996-04-02 Heidelberger Druckmaschinen Aktiengesellschaft Convertible or shiftable varnish supply on finishing units in rotary printing presses
EP0767058A2 (de) 1995-10-02 1997-04-09 DeMoore, Howard W. Druckmaschine
DE19729985A1 (de) 1997-07-12 1999-01-14 Roland Man Druckmasch Vorrichtung zum Lackieren von Bedruckstoffen in einem Offsetdruckwerk einer Rotationsdruckmaschine
WO1999001282A1 (en) 1997-07-03 1999-01-14 Tresu A/S Method of operation of a printing unit and printing unit for offset machine
GB2327205A (en) 1997-07-12 1999-01-20 Roland Man Druckmasch Offset printing unit for varnishing printed materials
US5960713A (en) 1995-05-04 1999-10-05 Howard W. DeMoore Retractable printing-coating unit operable on the plate and blanket cylinders simultaneously from the dampener side of the first printing unit or any consecutive printing unit or any rotary offset printing press

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3174010B2 (ja) * 1997-02-18 2001-06-11 清水製作株式会社 印刷機のドラム清掃装置

Patent Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1138055A (en) 1966-09-03 1968-12-27 Baker Perkins Ltd Improvements in rotary offset printing units
US4421027A (en) * 1981-04-25 1983-12-20 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Multiple printing mode printing machine system
GB2119711A (en) 1982-05-05 1983-11-23 Polygraph Leipzig Combined moistening and lacquering means in a printing machine
US4567823A (en) 1982-06-07 1986-02-04 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Arrangement on multi-color rotary presses for application of liquids to a printing unit cylinder
JPS59209875A (ja) 1983-05-16 1984-11-28 Komori Printing Mach Co Ltd 印刷機用給水・ニス塗り兼用装置
DE3500437A1 (de) 1984-04-04 1985-10-17 VEB Kombinat Polygraph "Werner Lamberz" Leipzig, DDR 7050 Leipzig Schalteinrichtung fuer ein kombiniertes feucht- und lackierwerk
US4722273A (en) 1985-03-01 1988-02-02 Heidelberger Druckmaschinen Ag Washing device for washing a rubber blanket in a rotary offset printing press
GB2184982A (en) 1985-12-04 1987-07-08 Luigi Ghisalberti Printing machines with multiple liquid supplying trains
US4741269A (en) * 1986-08-01 1988-05-03 Graphic Specialties, Inc. Dampening apparatus for printing press
US4796556A (en) 1987-06-24 1989-01-10 Birow, Inc. Adjustable coating and printing apparatus
DE3941571A1 (de) 1988-12-27 1990-06-28 Polygraph Leipzig Verfahren und einrichtung zum verarbeiten von spezialfarben in bogenoffsetdruckmaschinen
EP0574124A1 (de) 1992-05-06 1993-12-15 DeMoore, Howard W. Beschichtungsvorrichtung für eine Offset Bogenrotationsdruckmaschine
US5503674A (en) 1993-04-20 1996-04-02 Heidelberger Druckmaschinen Aktiengesellschaft Convertible or shiftable varnish supply on finishing units in rotary printing presses
US5960713A (en) 1995-05-04 1999-10-05 Howard W. DeMoore Retractable printing-coating unit operable on the plate and blanket cylinders simultaneously from the dampener side of the first printing unit or any consecutive printing unit or any rotary offset printing press
EP0767058A2 (de) 1995-10-02 1997-04-09 DeMoore, Howard W. Druckmaschine
WO1999001282A1 (en) 1997-07-03 1999-01-14 Tresu A/S Method of operation of a printing unit and printing unit for offset machine
DE19729985A1 (de) 1997-07-12 1999-01-14 Roland Man Druckmasch Vorrichtung zum Lackieren von Bedruckstoffen in einem Offsetdruckwerk einer Rotationsdruckmaschine
GB2327205A (en) 1997-07-12 1999-01-20 Roland Man Druckmasch Offset printing unit for varnishing printed materials
GB2327196A (en) 1997-07-12 1999-01-20 Roland Man Druckmasch Device for varnishing printed materials in an offset printing unit

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060191429A1 (en) * 2003-04-01 2006-08-31 Jensen Jesper R Printing with flexographic inks and lacquer
US7497161B2 (en) * 2003-04-01 2009-03-03 Tresu Anlaeg A/S Printing with flexographic inks and lacquer
US20050247228A1 (en) * 2004-05-04 2005-11-10 Muller Martini Holding Ag Apparatus with slide-in unit and coating device attached thereto
US20080092758A1 (en) * 2006-10-20 2008-04-24 Hiromitsu Numauchi Stop position control method and apparatus of rotary stencil printing press
US20080173194A1 (en) * 2007-01-19 2008-07-24 Julius Domotor Lithographic offset press and method of applying a thin layer of moisture directly to a blanket cylinder
US20080229954A1 (en) * 2007-03-20 2008-09-25 Komori Corporation Cleaning apparatus
US20080229953A1 (en) * 2007-03-20 2008-09-25 Komori Corporation Cleaning apparatus
US7726240B2 (en) * 2007-03-20 2010-06-01 Komori Corporation Cleaning apparatus

Also Published As

Publication number Publication date
ES2241655T3 (es) 2005-11-01
EP1218185A1 (de) 2002-07-03
EP1218185B1 (de) 2005-05-18
DE60020252T2 (de) 2006-01-19
ATE295779T1 (de) 2005-06-15
WO2001025010A1 (en) 2001-04-12
AU7405900A (en) 2001-05-10
DE60020252D1 (de) 2005-06-23
DK199901408A (da) 2001-04-02
JP2003511262A (ja) 2003-03-25

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